Development of a Rectifying Interface for a Hybrid Pulse-Tube/Reverse-Brayton Cryocooler

Diab, A. K.; Nellis, Gregory; Maddocks, J. R.; Yarbrough, S. A.

doi:10.1063/1.1774877

Cited by 2 publications

(1 citation statement)

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“…The Pulse Tube Rectifying Interface (PT/RI) converts the oscillating pressure within the cryocooler to a quasi-steady pressure difference between the two buffer volumes [2]; this pressure difference is used to provide a small, steady flow of cold gas that is capable of transporting the refrigeration capacity much more efficiently than a conductive strap. The mass flow in the distribution loop is controlled using a valve; the valve is adjusted using a feedback controller to provide distributed load temperature control.…”

Section: Introductionmentioning

confidence: 99%

Automatic Distributed Load Temperature Control Strategies for a Rectified Continuous Flow Loop Interfaced With a Pulse Tube Cryocooler

Skye¹,

Nellis²,

Klein³

2008

AIP Conference Proceedings

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Distributed thermal loads are frequently encountered in large deployable structures used in space applications such as optical mirrors and focal plane electronics. An innovative mechanism for providing distributed cooling is an oscillatory pulse-tube cryocooler that is integrated with a fluid rectification system consisting of check-valves and buffer volumes in order to extract a small amount of continuous flow. This continuous flow allows relatively large loads to be accepted over a long distance.An additional advantage of the rectified system is the ability to provide rapid and precise temperature control via modulation of the flow rate in the flow loop. This paper presents an experimental demonstration of this temperature control method. A rectified interface is integrated with a thermal load and subjected to various thermal disturbances. Temperature regulation is enabled using temperature feedback control of a valve placed in the distribution loop. The control parameters are selected to meet temperature regulation specifications, including maximum temperature deviation and settling time in response to a step change in distributed load. The measured controlled transient behaviors to step and sinusoidal distributed load variations are presented. The predicted and measured behaviors are compared in order to validate the thermal model of the rectifying interface system.

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Section: Introductionmentioning

confidence: 99%

Automatic Distributed Load Temperature Control Strategies for a Rectified Continuous Flow Loop Interfaced With a Pulse Tube Cryocooler

Skye¹,

Nellis²,

Klein³

2008

AIP Conference Proceedings

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Rectified Continuous Flow Loop for the Thermal Management of Large Structures

Skye¹,

Hoch²,

Nellis³

et al. 2006

AIP Conference Proceedings

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This paper describes a theoretical investigation of the ability of the rectifying interface to precisely control the temperature of a distributed load under dynamically changing conditions. The precise temperature regulation is enabled using temperature feedback control of a throttle valve placed in the loop. Flow modulation using the throttle valve is governed by a Proportional-Integral (PI) controller with gains that are selected to meet design temperature control criteria; specifically, a maximum temperature fluctuation and settling time. A linear thermal model based on experimental data is used to develop the control algorithm. The model demonstrates the ability to regulate the distributed load temperature under rapid load changes.

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Development of a Rectifying Interface for a Hybrid Pulse-Tube/Reverse-Brayton Cryocooler

Cited by 2 publications

References 0 publications

Automatic Distributed Load Temperature Control Strategies for a Rectified Continuous Flow Loop Interfaced With a Pulse Tube Cryocooler

Automatic Distributed Load Temperature Control Strategies for a Rectified Continuous Flow Loop Interfaced With a Pulse Tube Cryocooler

Rectified Continuous Flow Loop for the Thermal Management of Large Structures

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